British singer Lily Allen has fuelled speculation she's set to wed boyfriend SAM COOPER after showing fans a picture of herself wearing a diamond on her ring finger.The Smile hitmaker's partner is said to have proposed while they spent Christmas (10) at a resort in Bali, Indonesia. Allen has been keeping quiet about the swirling rumours but now appears to have confirmed them by showing her online followers a snap of what is believed to be an engagement ring. In the picture, which was posted on Allen's official blog on Monday (10Jan11), the singer can be seen wearing a diamond sparkler as well as a studded band on her marital finger. A caption reads: "A girl can't do Manhattan sans (without) manicure." The reported engagement comes after Allen lost a baby son six months into her pregnancy in October (10).